The Collaborative International Dictionary of English v.0.48:

Jiggle \Jig"gle\, v. i. [Freq. of jig.]
   To wriggle or frisk about; to move awkwardly; to shake up and
   down.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jiggle
    n 1: a slight irregular shaking motion [syn: joggle, jiggle]
    v 1: move to and fro; "Don't jiggle your finger while the nurse
         is putting on the bandage!" [syn: jiggle, joggle,
         wiggle]